1st September 1974: birth of Burn Gorman, who played randy (and later undead) medic Owen Harper in the first two series of Torchwood (2007-2009).

ii) broadcast anniversary

1st September 1979: broadcast of episode 1 of Destiny of the Daleks, opening episode of Season 17. Romana regenerates; the Tardis lands on Skaro a radioactive planet; the Doctor is captured by the Movellans, and Romana threatened with extermination by the Daleks.

iii) dates specified in spinoff literature

1st September 1991: happens over and over again in the Suffolk town of Thorington. Incidentally, what happened to the sea? (as told in the 2008 Eighth Doctor audio play, Brave New Town)